Re: Bad DC Offset TL072 Op-amp
Hi guys,
Finally fixed this. I took it to an electronics repair place but even they gave up. I then recovered the unit about 2 weeks ago and in between times i have learned a great deal more about D/A circuits and Op-Amps. Anyway it turns out that the OpAMp on input 1, a 4565 was faulty and then two further Op-Amps TL072s near the A/D end of the circuit, which feed back into the Analog part of the circuit were faulty too.
I only started looking further up and down the audio change after i checked the DC offset circuitry around the TL072s which i thought were originally the problem. Not looking beyond this was my mistake as i was convinced that the 'DC offset' message related to the DC Offset Trimmer circuit around the TL072.
If anyone wants further detail do let me know.
Hi guys,
Finally fixed this. I took it to an electronics repair place but even they gave up. I then recovered the unit about 2 weeks ago and in between times i have learned a great deal more about D/A circuits and Op-Amps. Anyway it turns out that the OpAMp on input 1, a 4565 was faulty and then two further Op-Amps TL072s near the A/D end of the circuit, which feed back into the Analog part of the circuit were faulty too.
I only started looking further up and down the audio change after i checked the DC offset circuitry around the TL072s which i thought were originally the problem. Not looking beyond this was my mistake as i was convinced that the 'DC offset' message related to the DC Offset Trimmer circuit around the TL072.
If anyone wants further detail do let me know.
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